Class Lsp

pw

private float[] pw

Lsp

public Lsp()

Constructor

cheb_poly_eva

public static final float cheb_poly_eva(float[] coef,
                                        float x,
                                        int m)

This function evaluates a series of Chebyshev polynomials.

Parameters:

coef - - coefficients of the polynomial to be evaluated.

x - - the point where polynomial is to be evaluated.

m - - order of the polynomial.

Returns:

the value of the polynomial at point x.

enforce_margin

public static void enforce_margin(float[] lsp,
                                  int len,
                                  float margin)

Makes sure the LSPs are stable.

Parameters:

lsp -

len -

margin -

lpc2lsp

public static int lpc2lsp(float[] a,
                          int lpcrdr,
                          float[] freq,
                          int nb,
                          float delta)

This function converts LPC coefficients to LSP coefficients.

Parameters:

a - - LPC coefficients.

lpcrdr - - order of LPC coefficients (10).

freq - - LSP frequencies in the x domain.

nb - - number of sub-intervals (4).

delta - - grid spacing interval (0.02).

Returns:

the number of roots (the LSP coefs are returned in the array).

lsp2lpc

public void lsp2lpc(float[] freq,
                    float[] ak,
                    int lpcrdr)

Line Spectral Pair to Linear Prediction Coefficients

Parameters:

freq -

ak -

lpcrdr -